In India the steel production industry requires the import of

The Indian steel industry significantly depends on the import of coking coal.

Approximately 0.8 tonnes of coking coal is required to produce one tonne of steel.

Saltpetre (Potassium nitrate) is not used in steel production. It is primarily used in the production of fertilizers, rocket propellants, and fireworks. It's also a key component of gunpowder.

Hence, the correct answer is coking coal.

Sources:

• Wikipedia - Potassium nitrate
• Economic Times - Duty on coking coal import